CesiumGS/cesium

Export KML Sandcastle - model cannot be opened in Google Earth?

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#9,222 opened on Nov 2, 2020

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 (2 comments) (0 reactions) (0 assignees)JavaScript (11,758 stars) (3,324 forks)batch import
category - kmlcategory - sandcastlegood first issuetype - cleanup

Description

Discovered while testing Sandcastles for the 1.75 release. This appears to be an issue in the last release too.

  1. Go to the Export KML Sandcastle (https://sandcastle.cesium.com/index.html?src=Export%20KML.html)
  2. Choose "Model" and "Download"
  3. Open this KMZ in Google Earth

It fails to load with the following error:

image

I can open this COLLADA file successfully in Blender:

image

We should investigate if this is something we're incorrect/invalid in the sample model we're using here that Blender is accounting for.

Contributor guide

Tech stack
javascript
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
basic knowledge of 3D file formatsfamiliarity with Cesium
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the COLLADA model used in the Export KML Sandcastle. Compare its structure with models that open correctly in Google Earth. Check Cesium's KML export logic in the source code (likely in Source/Widgets or Source/DataSources). Consider testing with a simpler model to isolate the issue. Look for any known compatibility issues between Cesium's COLLADA output and Google Earth.